Top answers

What is red-shift and how does it work?

When we see light, the colour of light that we see is determined by the wavelength of the light. Violet light has the shortest wavelength, and red light has the longest wavelength. Red shift happens when we ...
TD
2645 Views

A newspaper runs a competition in which every entrant guesses an integer between 0 and 100 inclusive, the winner of the competition is the person who's guess is closest to 2/3rds of the average integer guessed, what number do you guess?

If I was helping prepare a student for an oxbridge interview I would begin by reminding them not to rush into the answer, explaining that tutors want to see your logical thinking process, and that rushing in...
DO
1659 Views

Explain the difference between a longitudinal and transverse wave.

Imagine we have a wave that is travelling from left to right. This is the wave's direction of motion, or what is sometimes called the direction of "energy propagation". In a transverse wave the par...
RG
Answered by Ross G. • Physics tutor
6978 Views

Explain three factors that could lead to an increase in demand for cigarettes.

Demand is the total amount of goods and services that consumers are willing and able to purchase at a given price in a given time period. The Law of Demand states that as the price of a product falls, the qu...
JT
16370 Views

Solve x^2-5x+6=0

To solve this, we need to factorise the expression (write as a product of two brackets). To do this we want to find to numbers that multiply to make +6 and add up to -5, for this case. These numbers turn out...
SP
Answered by Samuel P. • Maths tutor
6974 Views